The Guidance for Performing Preliminary Assessments Under CERCLA is applicable to the most commonly encountered sites and site conditions. This document provides guidelines and instruction on PA evaluation, scoring, and the use of standard PA scoresheets.

Guidance
for Performing Site Inspections Under CERCLA

The Guidance for Performing Site Inspections Under CERCLA is applicable to the most commonly encountered sites and site conditions. This guidance discusses how to review and evaluate available information, plan an effective sampling strategy to acquire analytical data to evaluate a site according to the HRS, and prepare required reports and work products.

Hazard Ranking
System Guidance Manual

The Hazard Ranking System Guidance Manual provides general and technical guidance for individuals involved in determining HRS scores and preparing HRS scoring packages. The manual clarifies terms and concepts in the HRS, presents strategies and specific guidance for scoring selected HRS factors, and provides guidelines to assist in collecting and organizing relevant data.
For more information on HRS Acronyms and Terms, access the Glossary of HRS Acronyms and Terms (A-L) and
Glossary of HRS Acronyms and Terms (M-Z).

Hazard Ranking System; Final Rule December
14, 1990

This revision to the Hazard Ranking System (HRS) was published in the Federal Register (Volume 55, Number 241) on Friday, December 14, 1990.

The NPL Listing Policy Documents currently contains a Policy for Withdrawing a Proposal to List a Site on the NPL, a Policy for Obtaining a Govenor's Letter prior to Listing on the NPL, and a Policy for Clarifying the Definition of "Site" under the NPL.